"I need to fight these bigger guys to know I can actually handle it because I've got that world title shot later in the year that's potentially getting offered."

Zerafa said Horn had an awkward style and wasn't averse to using his elbow and head.

"I've got to be first, we can't give him confidence, we can't give him room to move and bully us," Zerafa told AAP.

He has needled Horn throughout the build-up and tossed more barbs his way on Friday.

Zerafa called Horn 'a weak person' (Getty)

"I just saw a weak person," he doesn't look fit," Zerafa said .

Horn chuckled when he heard that remark and also rejected Zerafa's assertion that being heavier would make him slower, saying trainer Glenn Rushton had worked hard on his legs and he hadn't lost any mobility.

He's adamant he isn't being distracted by the prospect of a mooted world title shot on December 23 in Japan against WBA regular middleweight champion Ryota Murata.

"It's always there but you do have your partitions in your brain that is shut off for a while," Horn said.